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    4.

    Calculate the total pressure in a 10.0 L cylinder which contains 0.4 g helium, 1.6 g oxygen and 1.4 g nitrogen at 27\,^\circ C.

    A

    0.492atm  0.492{\rm{ }}\,\,atm\;

    B

    49.2atm49.2{\rm{ }}\,\,atm

    C

    4.92atm4.92{\rm{ }}\,\,atm

    D

    0.0492atm0.0492{\rm{ }}\,\,atm

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    8.

    The pressure and temperature of 4dm34{\rm{d}}{{\rm{m}}^3} of carbon dioxide gas are doubled, then the volume of carbon dioxide gas would be

    A

    2dm32\,\,{\rm{d}}{{\rm{m}}^3}

    B

    3dm33\,\,{\rm{d}}{{\rm{m}}^3}

    C

    4dm34\,\,{\rm{d}}{{\rm{m}}^3}

    D

    8dm38\,\,{\rm{d}}{{\rm{m}}^3}

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